With a good wet mount I don't think there would be much if any difference in the readings produced. There were a couple of problems I had with a wet mount of the HDS tranducer, mostly related to it requiring a large space. The standard transducer for that unit is huge (for a kayak), which requires a big container for a wet mount. That takes up valuable space and adds weight to your ride. In my kayak, you would have a hard time installing a wet mount container anywhere but the center of the hull (the most valuable storage space). It is also the place most likely to be bumped by my other gear which could damage the container or the Goop job on surf launches. This one was pretty much "set it and forget it". The manufacturer said that there was not even any concern for scrapes and scratches on the face of the transducer from dragging your yak.
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